Move output surface fallback from cc to embedders

cc/test/layer_tree_pixel_test.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_TEST_LAYER_TREE_PIXEL_TEST_H_
 #define CC_TEST_LAYER_TREE_PIXEL_TEST_H_
 
 #include <vector>
 
 #include "base/files/file_path.h"
@@ skipping 22 matching lines @@
  public:
   enum PixelTestType {
     PIXEL_TEST_GL,
     PIXEL_TEST_SOFTWARE,
   };
 
  protected:
   LayerTreePixelTest();
   virtual ~LayerTreePixelTest();
 
-  scoped_ptr<OutputSurface> CreateOutputSurface(bool fallback) override;
+  scoped_ptr<OutputSurface> CreateOutputSurface() override;
   void CommitCompleteOnThread(LayerTreeHostImpl* impl) override;
 
   virtual scoped_ptr<CopyOutputRequest> CreateCopyOutputRequest();
 
   void ReadbackResult(scoped_ptr<CopyOutputResult> result);
 
   void BeginTest() override;
   void SetupTree() override;
   void AfterTest() override;
   void EndTest() override;
@@ skipping 50 matching lines @@
   base::FilePath ref_file_;
   scoped_ptr<SkBitmap> result_bitmap_;
   std::vector<scoped_refptr<TextureLayer>> texture_layers_;
   int pending_texture_mailbox_callbacks_;
   bool impl_side_painting_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_LAYER_TREE_PIXEL_TEST_H_